Bug: Unread threads in watched forums

I just went through all subforums and pressed "Mark Read" on all of them. However, when I open the "Unread threads in watched forums" under "Find threads", it still shows 4 pages of threads. Even when I open a thread and then reload the page it stays. From a quick comparison with the "Threads in watched forums", it seems it's still showing all threads I hadn't opened before pressing the "Mark Read" button.
 
On the slight chance this might help in the meantime:

I don't have any watched forums. My PCG shortcut is…
…which when I visit every 2-3 days gives me 2-3 pages of threads—from all forums—which have new replies since my last visit, plus "threads below haven't been updated since your last visit".
 
On the slight chance this might help in the meantime:

I don't have any watched forums. My PCG shortcut is…
…which when I visit every 2-3 days gives me 2-3 pages of threads—from all forums—which have new replies since my last visit, plus "threads below haven't been updated since your last visit".

I have that page set up to show unread, watched and participated threads.
 

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